124 THE CHALLENGE OF THE N.W. FRONTIER such destruction of normal home life leads to banditry, as we have recently seen, on a large scale, in China. He then goes on to show that the aeroplane's very efficiency may lead on to a new danger. In earlier days, the Administrator would do everything in his power to win over the tribes by peaceful means, and would only call in the military as a last resort. Now, however, he can use the air-bombing method immediately. The speed of bombing makes him ready to lay aside the slow method of persuasion. Force thus becomes too easy and convenient, and this intensifies the "militarist" attitude. An area that is tranquil, merely through fear of bombs, does not necessarily mean good administration. In the last place, Captain Mumford points out that air-bombing of villages strikes hardest at the poor—the weak, the aged, the sick—who stay at home. It hits the innocent and spares the guilty. It is quite definitely an attack on what may be called the "civil population" in order to make the "military" surrender. "This is a policy," he says, "suicidal for Europe and morally indefensible against subject races. Undeveloped areas must be developed, not bombed. The initial cost of building roads is not out of proportion to the cost of bombing aeroplanes. The subsequent value of roads will be considerable. Mountain areas, with their relatively generous supply of water (if conserved) and their variations in climate, can be of value for agriculture, health, and pleasure.